INDEX 
Starred page numbers indicate where cuts occur. App. refers to the Appendix, 
Absorption of carbon dioxide, 136- 
140. 
Absorption, selective, 44. 
Acacia, leaf of, *110. 
Accessory buds, 88, *89, *90. 
Accessory fruits, #189, 190. 
Acuminate, App., *264. 
Acute, App., *264. 
Adaptations to conditions of exist- 
ence, 204, 205. 
Adherent, 155, *156. 
Adnate, 155, #156. 
Adyventitious buds, 95. 
Adventitious roots, 30, *81. 
Aérial roots, 30, *81. 
Agaricus, study of, *228, *229, *230. 
Age of trees, 54, 55. 
Aggregate fruits, *189. 
Ailanthus twig, *88. 
Air, relation to germination, 8-10. 
Air chamber, *128, *129. 
Akene, *185, 186. 
Albuminous substances, 19. 
Algee, 210, 215-222*. 
Alternate, *52. 
Alternate leaves, *106. 
Alternation of generations, 
248. 
Anatomy of plants (see under root, 
stem, leaf, flower, fruit, structure 
of). 
or 
fy 
bo 
Angiosperms, 211. 
Angiosperms, oldest, 261. 
Animal food, need of, 122. 
Animals, defenses against, 
126*., 
Annual growth, indefinite, 54. 
Annual ring, *73. 
Annuals, 54. 
Anther, #153. 
Anther, modes of opening, *162. 
Antheridia, #220, #221, *241, 242, 
*246, 251. 
Antherozoids, #220, 221, #241, 242. 
Antipodal cells, *166. 
Ants plant seeds, *199, 
Apetalous, *149. 
Apple leaf, stipules of, *100, 101. 
Aquatic roots, 31, 82. 
Arch of hypocotyl], 22, #28, 24. 
123- 
Aristolochia stem, bundle of, *69. 
Aristolochia stem, cross-section of, 
*68, 70. 
Arrangement of leaves, 105-110. 
Arrow-shaped, App., *264. 
Ascus, 284. 
Ascomycetes, 210. 
Asexual generation, 257. 
Asparagus, 61, *62. 
Aspidium, *244, *246. 
Asplenium, study of, 2438-246*, 
71 
